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You should be able to get reasonably close by measuring the clearance ramps. You will see a gradual lift as the valve begins to open, then change to a more rapid rise. Play with it until you find the point where the rate of lift increases and read the amount of lift on the dial indicator. This should be the approximate desired lash. This is assuming the cam was ground with clearance ramps. Or it could be like Isky's first cams. He didn't know about this so his cams just slammed the valves open. He said they were quite noisy but must have ran good. Moonshiners in the South liked them.